Telephony.



I. KITSBB. -1

TELBPHoNY. l APLmATIoN FILED umm, 1907.

IN1/EN oR.

.Patented Deb. so, 1913.

matic view of latelephonic circuit 'embodying Q' is a planiview'ofavoltaic resistance, such as an ordinary' dry entran sraras rarnnronnrpn,'Isnon Krisen; or PHILADELPHIA, rnNNsYLv-.e-ivranssionon, BY Dinner ANDMnsnn nss'rennnnrs'ro AMERICAN TELEPHONE' ann r'etnenar'n COMPANY, orNEW Yoan, N, Y., A conro'ne'fron lor 'new Yoan TELEPHONY( meente.

To zZ'Z whom-imag concern State ott Pennsylvania, have'inventedcertain4new and useful Improvementsin Telephony.,

oit-which the following is 'aspeci'ficatio'nin telephony.

' It is more specially intended for vtele-phone circuits, wherein alarge series'of sub-stasi tions are connected to one common line and it,therefore, lends itself readily 'to 'telephone work in railroading. I

In 'the drawing, Figure 1 1s a diagrammy invention; Fig.

battery.

In Fig. 1, 1 and lQare the lines oi transmission. These 'lines fareconnected together 'at their terminals lcyV the batteries 3 and '4. lnthe drawing, the line is illustrated as to he provided with -the three'stations A, B and C. The devices and their arrangements are` similar at'each station and similar parts arev similarly designated therein'. lnseries with the circuit, for each station, is thecoil 5 of anannunciating device illustrated here as the one-stroke bell 6. In serieswith the line vprimary 9 of an inductorium; but instead of providing foreach of the transmitting 'arrangements a 4separate source of current,

I make use of the coil 5 inserted in series as to the line, as thesource to provide the necessary energy, so as to generate impulses inthe secondarylO of the inductorum. The arrangement for such purpose isas follows:

Y One terminal 'of the micro-phonic transmitter 8 is connected to oneterminal o the coil 5 and the other terminal .of said coil is connectedwith the shunt, wire 11. The

micro-phonietransmitter is, with the interposition ofv the primary 9,connected permanently with the lever 12 and the wire 11 is connected tothe contact point 13 in juxtaposition to said lever. Said lever isadapted -to connect, when released from its receiver,

with the point 13 and thereby make a circuit A shunting the coilaand-this 'shunt includes yinvention relates to'an improvement'specificaties of tene-'rs rate-1e. Patienten Daman, 1913, l Applicationifiled. 'April-24, 1907. Serial 'Na-369,970;

.point 15, :also in juxtaposition to thelever V 12 and adapted'toiconnect with this lever when"the receiver is removed. The" otherterminal of the l secondary 10 -is connected oneterminal 'of thisreceiver 16'and the second terminal or receiver 16 is connected throughwire 17 with the 'line wire 2.

l will rst describe the working of thecalling-up device: The line is, aswas clearly stated, normally/closed through the batteries ''fand 4E.' Itis true that one ofthe batteries 7e 3 'or'4 'may be omitted, but itwasfound in .practice that-it is 'best to provide Aeach -ter- 1 mmalofthe line with a battery, for the rea- 'son-that when a break occurs inthe middle of the line, the .ringing-up device of that @part, minus thebattery, would be entirely batteries 3 and 4.- arein series, so as toaug- 8 0 ment each other. The coil 5 of each station is, therefore,normally energized and the armature of the bell arrangement '6 is alsodrawn toward the core of this coil'and is,

therefore,- as illustrated in the drawing, in v Contact with the-bellproper. lf now an operator desires to -call uplra station, he rst`4opens his key. Through the opening oit' his key; the continuity of 'thelline is broken and-j the electro-magnet 5 is denergized. The 90operator then4 presses and releases the key as often as he desires tostrike the bell of the station called. It is supposed that the operatorat A. desires to call up the station B 'and that the signal for saidstation is three 95 strokes. He openshis key and presses the lever, soas to close the circuit and releases the same'then, so f as to open Vthecircuit, which manipulation will result in one stroke.

Herepeats this operation, two calls there-Jim 'fore giving three strokesor rings and at the last stroke, he closes' the key entirely. Theoperator at B will thereby be notified that he is wanted. As tothe-transmittin arrangement, itis clearly shown by the rawing, that the'shunt comprising the microphone' and primary 9 is -normally open,I thusfor the reason that tlie' coils 5 should the'lmicro-phone 8 and rtheprimary 9. llt is 55 receive all the current as long as they may beneeded for the calling-up. lVhen, now, the operator at B has answeredthat he is ready, both the operators, at station A as Well as station B,remove the receiver 16 from the hook 1Q. This operation results in thecon` tacting of the hook 1-2 with the point 13, thereby closing theshunt including the transmitting device. Both operators then use thephone in the usual manner.

It must be stated-here, that normally, that is, when the line is out ofuse, the secondary 10 and therefore the receiver 16 is not conncctcd tothe line, for the reason that where there are a multitude of stations,the connection of the receiver and secondary either in series to theline or in multiple arc thereto, is a great drawback and is the cause ofthe speech being less distinct. In my arrangement, no matter how manystations are connected to the line, the line is normally minus all thereceirei's and secondaries, and when the line is in use, only the twostations conversing have the 'secondary and phone connected to the linein multiple arc. No other path, therefore, is present. When the operatorhas removed his receiver from the hook, the connection of the hook withthe contact 15 is established and the impulses generated in 10, say atstation A, will ilow from 10, through condenser 14, point 15, lever '12,Wire 1l, line Wire 1, and will return through the receiver at the otherstation and through line wire 2 to wire 17 and receiver of the homeinstrument, and as the condensers 18 are better pat-hs than the coils 5,the telephonic impulses will be able to flow-without interruption andWithout impedance,from one station to a Second station. It may be saidthat the impulses generated at 10 may take the short path from station Athrough the battery 3 and Will not How over the line. It is,therefore,vneces sary to provide the terminals of the circuit withimpedances, opaque to the 'flow of the telephonie impulses and I haveprovided nals of Said circuit and means to prevent the HOW of thecurrent in its entirety through the terminals of the line, during thetime that one or the otherof said sub-stations is in use.

2. In a telephonie circuit, a series of stations, each stationcomprising transmitting and receiving devices and also comprising anannunciatingdevice, the circuits for both the transmitting and receivingdevices normally Ope'nand adapted to be closed through the movement of aswitch, the annunciating device normally in series with i' the line, thecircuit of the transmitting device shunting the coil of theannunciatingdevice, in'combinat-ion'with telegraphic keys inserted inthe line in series and adapted,h

through their dmovement, to operate the an-v nunciating devices of thedifferent stations.

3. A telephonie circuit, a battery for each 'i terminal thereof, asingle-stroke-bell 'in series thereto, a telegraphic key in combinationwith said bell, a telephonie transmitter and a primary of an inductoriumin shunt tol the coil of said bell, the secondary of the nductorium andtelephonie receiver in multiple arc as to said circuit.

In testimony whereof I aix my signature in presence of two Witnesses.

'ISIDOR KITSEE. Witnesses MARY C. SMITH, EDITH R. SHELLEY.

Copies of this patent may be obtained for ve cents each, by'addressingthe i Commissioner of Patenti: Washington. D. G.

